Closest thing I go to using my name online is EMT, Beth or Elizabeth. I don't see why people are so paranoid about people knowing their names. Just as long as they don't give out their last name or any other personal information such as their phone number or address, card number, PIN number, etc, they should be fine.
As a kid I used my nick and lack name and that was a dumb thing of me to do but lot of teens do that because they're naive about it. It's amazing how I've heard about teens giving out their first and last name, their address, name of their school, their hometown, etc. After hearing and reading what has happened to them, I knew what information to give out but I don't have a problem giving out what city I live in. No one can't find my residence here if they don't know my phone number or last name.